Registration for Boulderthon 2023 is now open! After nearly tripling in size and selling out last year, Boulderthon has instituted a new 5,000 runner cap and is expected to sell out again this year. Register today.
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Boulderthon®, the Signature Boulder Marathon & Half Marathon, is seeking strategic brand partners.

If interested, please contact us by submitting the form for more information.

Title Sponsorship for Boulderthon® represents the premier level of partnership for the race series. As the Title Sponsor, your organization benefits by becoming the namesake of the Boulderthon® race series, which is included in every corporate, marketing and news outlet communication.

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© 2023 Stronger Faster Boulder Co.

Boulderthon is a Boston Marathon Qualifying (BQ), USATF Sanctioned Event, measured by a Level A USATF Course Measurer, representing the highest level of certification for a marathon race series.

Based in Boulder, Colorado, Stronger Faster Boulder Co. is a Colorado non-profit organization and federally-recognized as a 501(c)(3) tax-exempt foundation, EIN # 84-2863972. Donations and contributions are tax-deductible as allowed by law.